Installing the Camshaft Timing Chain

Fig 1: Camshaft Timing Chain And Camshaft Sprocket

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-- Engage the camshaft timing chain with the painted links -arrows- on the camshaft pins.

-- Place the camshaft timing chain on the intake camshaft, exhaust camshaft and the crankshaft. Position the painted chain links -arrows- on the marks on the chain sprockets.

Fig 2: Camshaft Timing Chain And Intake Camshaft

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-- Install the guide rail -2- and tighten the bolts -1-.

Fig 3: Removing Glide Rail

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-- Install the upper glide rail -1-.

Fig 4: Removing Guide Rail

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• The help of a second technician is necessary for the following step.

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I -  Turn the exhaust camshaft slightly in direction of -arrow A- using the :T40266  and push the :T40271/1  out of the chain sprocket splines -B-.

II -  Release the camshaft in the direction -arrow C-, until the timing chain touches the glide rail -1-. Hold the camshaft in this position, install the tensioning rail -2- and tighten the bolts -3-. Release the camshaft.

-- Turn the intake camshaft with the :T40266  in direction of -arrow 1- until the :T40271/2  can be pushed out of the chain sprocket splines in direction of -arrow 2-. Release the camshaft.

Fig 5: Identifying Assembly Tool T40266 And Camshaft Clamp T40271/2

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-- Remove the :T40271/1  and :T40271/2  .

-- Install the bolts -arrows- and tighten them. Tightening specification -item  4-.

Fig 6: Identifying Bolts

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-- Coat the holes -arrows- with engine oil.

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-- Check if the adapter sleeve -1- is installed. (Not present on every bearing bracket.)

Fig 7: Identifying Bolts

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• Carefully mount the bearing bracket without tilting it.

-- Attach the bearing mount and install the bolts -arrows- all the way by hand.

-- Remove the :T40267  .

Fig 8: Securing Chain Tensioner With T40267

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-- Tighten the bearing bracket bolts. Refer to Figure.

-- Install the chain tensioner -2-. The wire clip must come in to contact with the oil pan upper section opening -arrow-. Tighten the bolt -1- and remove the :T40011  .

Fig 9: Identifying Chain Tensioner

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-- Checking adjustment:

Fig 10: Identifying Painted Chain Links Must Line Up With Markings On Chain Sprockets

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• The painted chain links must align with the markings on the chain sprockets. -arrows-.

-- Install the control valves -item  7-.

-- Turn the engine twice in the direction of engine rotation.

TIP:

Due to the ratio, the colored chain links no longer match up after the engine has been turned.

-- Remove the :T10531/4  and remove the :T10531/3  .

Fig 11: Identifying Assembly Tool - Turning Over Tool T10531/3

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-- Install the lower timing chain cover. Refer to LOWER TIMING CHAIN COVER, REPLACING .

Checking Valve Timing - with Marks on the Cylinder Head Cover

Fig 12: Identifying Vibration Damper With Counterhold - Vibration Damper T10355

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TIP:

The combination of the shown :T40263  , : T40314  and 24 mm socket are better suited than the :T10355  for positioning the vibration damper.

-- Turn the vibration damper in the "TDC" position.

• The notch on the vibration damper must align with the arrow marking on the lower timing chain cover -arrow-.
• The markings -1- on the camshaft chain sprockets must be opposite the markings -2 and 3- on the cylinder head cover.

Checking Valve Timing - without Marks on the Cylinder Head Cover

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TIP:

The combination of the shown :T40263  , : T40314  and 24 mm socket are better suited than the :T10355  for positioning the vibration damper.

-- Turn the vibration damper in the "TDC" position.

• The marks applied to the cylinder head cover -arrows- must align with the marks on the chain sprockets -1-.
• The notch on the vibration damper must align with the marking on the lower timing chain cover -2-.

Continued for All Engines:

-- Install the vacuum pump. Refer to VACUUM PUMP, REMOVING AND INSTALLING .

-- Install the high pressure pump. Refer to HIGH PRESSURE PUMP, REMOVING AND INSTALLING .

-- Install the oil separator. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .

-- Install the ignition coils with power output stages. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .

-- Install the upper timing chain cover. Refer to UPPER TIMING CHAIN COVER, REMOVING AND INSTALLING .

-- When working on the chain drive perform an adaptation using the Vehicle Diagnostic Tester.

There are additional procedures depending on the model. Refer to CAMSHAFT, REMOVING AND INSTALLING .

Tightening Specifications

• Refer to OVERVIEW - VALVETRAIN 
• Refer to OVERVIEW - NOISE INSULATION .